Pump-piston



' UNITED STATES PATENT OFFicE.

I JOHN A. THROP, OF THREE RIVERS, MICHIGAN.

PU M'P-PISTON.

SPECIFICATION forming part of Letters Patent No. 252,066, dated January 10, 1882.

Application filed October 10,1881. (No model.)

To all whom it may concern:

' Be it known that I, JOHN A. THROP, a citizen of the United States, residing at Three Rivers, in the county of St. Joseph and State of Michigan, have invented certain new and useful Improvementsin Common Well-Pumps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the'letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in common well-pumps and it consists in an attachment to the sucker or plunger of a pump in the shape of an india-rubber sleeve or band fitted to and encircling the plunger, and held in place bya numberof teats or lugs on the innor side of the band,which fit into corresponding holes made in the outside of the wooden part of the plunger; and myinvention further consists in surrounding the lower bucket of a wellpump with a circular or annular rubber packing, having lugs similar to those above described on its inner surface, said lugs fitting into holes or openings in the outer surface of the bucket, for the purpose of making an airtightjoint and a perfect tit of the bucket to an irregular or oblong hole in the pump-log.

In the drawings, wherein similar letters of reference indicate like parts in the several figures, Figure 1 shows the plunger of a pump provided with my sleeve or band. Fig. 2 is a sectional view of the same with the side of the rubber band cut away to show the openings in the plunger and the lugs in the sleeve. Fig. 3

shows a section of a lower bucket provided withlan encircling rubber sleeve or band and having the staple or ring for removing the bucket from the pump-log, and also shows the thin disk-valve. Fig. 4 is a sectional view of the rubber packing.

I construct my plunger b in the usual manner, and ofthe customary materials,making a shoulder around the lower end to receive and hold the rubber sleeve to, which is annular in shape and slightly flaring at the top to fit the general shape of the plunger,lthe upper edge being madethinner so,thatit will readily bend inwardly and prevent buckling; and projecting from the insideof the sleeve is a series of four or more lugs or teats, f, which fitclosely in openings c,corresponding with them in size and depth, made in the plunger. As the rubber sleeve is made to fit closely tothe plunger, considerable effort will he required to force it into place on the plunger, but when once in place the lugswill enter the openings made't-o receive them, and it will be impossible to ac cidentally displace it. If, however, it is desired to remove the rubber sleeve, it can be done with ease and without injury either to the sleeve or plunger.

In the old method of using leather or rubber packing, where the same was-attached to the plunger by nails or tacks, it was impossible to remove the packing withoutinjuring'or destroying both the packing and the plunger.

Another advantage derived from theemployment of my rubber sleeve is that the plunger is strengthened instead of weakened, and there is no liability of the band turning round, and thus working oftthe plunger, noris there any danger of buckling.

Thelower bucket, h, (shown in Fig. 3,)is constructed with an encircling ring, of thick rubber, '5, provided with lugs on the inner side to fit in cavities in the sides of the bucket, as do the lugs of the sleeve in the holes in the outer surface of the plunger. This packing-ring, being very thick, makes an air-tight joint, and also where the hole in the pump log has become irregular from the unequalshrinking or swelling of the same after boring, or from decay or unsoundness in the wood, or from any other cause, the packing-ring w ill adapt itself to the inequalities of the bore and still preserve an air-tight joint.

The ring or staple k, attached to the lower bucket, is for the purpose of removing the bucket from the pump without taking the pump-log out from the well, and the shank of the ring passes through the center of the bucket,

and is secured thereto by a nut on the under side thereof, or in anyequivalent manner. The shank of this ring passesthrough the center i of a circular disk, of thin rubber, leather, or

some other flexible material, l,which rests upon the upper side of the bucket, is of equal size therewith, covers the openings therein for the passage of the water, and forms the valve, and this valve l is retained in position by the pass sage through its center of the shank of the ring 70, while its flexibility admits of its edges rising and allowing the upward passage of the Nvater through the openings in the bucket.

I am aware that rings orbandsof indiarubder and its compounds have been applied to wooden plungers for pumps to form a packing, and therefore I do not claim such packing,

. broadly; but

What I do claim as my invention and discovery, and desire to have secured to me by Letters Patent, is-

1. The packing of the plunger of a pump, consisting of an encircling sleeve or band of india-ruhber or its compounds, constructed with a series of lugs or teats on its inner side, the said lugs adapted to fit into a correspond- JOHN A. THROP.

Witnesses:

H. A. WING, SAML. J. THRoP. 

